Better sentence-writing in 30 minutes a day - Dianna Campbell 1995
A note on spelling
Subject-verb agreement
Revising at the word level
In the next exercise, you’ll notice that sometimes a small spelling change is necessary before you add an -s or -es to a base verb. For example, with a word that ends in -y, such as fry, you change the y to i before you add -es. So fry becomes fries.
Exercise 6.2
Fill in each blank with the form of verb at right that agrees with the subject. Use the base verb or add -s or -es. Make other spelling changes where necessary.
1. the article ___________ (explain)
the articles ___________
2. one baby ___________ (cry)
all the babies ___________
3. one player ___________ (win)
four players ___________
4. the team ___________ (perform)
the teams ___________
5. the ink spots ___________ (dry)
an ink spot ___________
6. the soldiers ___________ (march)
a soldier ___________
7. the telephone ___________ (ring)
telephones ___________
8. ideas ___________ (form)
an idea ___________
9. chickens ___________ (hatch)
a chicken ___________
10. a peacemaker ___________ (pacify)
peacemakers ___________